If $G$ is the geometric mean of $x$ and $y$,then $\frac{1}{G^2 - x^2} + \frac{1}{G^2 - y^2} = $

  • A
    $G^2$
  • B
    $\frac{1}{G^2}$
  • C
    $\frac{2}{G^2}$
  • D
    $3G^2$

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